1. XRN4658 – OTR UNCVR Amendment eChMC – 23rd July 2018

2. Implementation Approach
R3 changing UNCVR via XRN3656 (splitting Band 2 into 2 bands) - orange
XRN4658 amends the OTR value in bands 3-11 – blue cells
Lower AQ Band (kWh)
Upper AQ Band (kWh)
Tolerances where read will be accepted
Tolerances where a Read will be Accepted if Submitted within Override Flag (Inner Tolerance)
Outer Tolerance Where Read will be Rejected (Market Breaker) 1
0% - 2,000,000% of AQ/365 x no. of days
2,000,001% - 7,000,000 % of AQ/365 x no. of days
> 7,000,000% of AQ/365 x no. of days 2
100
0% - 20,000% of AQ/365 x no. of days
20,001% - 45,000 % of AQ/365 x no. of days
> 45,000% of AQ/365 x no. of days
101
200
0% - 10,000% of AQ/365 x no. of days
10,001% - 25,000% of AQ/365 x no. of days
> 25,000% of AQ/365 x no. of days
201
500
0% - 4,000% of AQ/365 x no. of days
4,001% - 55,000 % of AQ/365 x no. of days
> 55,000% of AQ/365 x no. of days
501
1,000
0% - 2,000% of AQ/365 x no. of days
2,001% - 25,000 % of AQ/365 x no. of days
> 25,000 % of AQ/365 x no. of days
1,001
5,000
0% - 400% of AQ/365 x no. of days
401% - 7,000 % of AQ/365 x no. of days
> 7,000% of AQ/365 x no. of days
5,001
10,000
0% - 200% of AQ/365 x no. of days
201% - 2,000 % of AQ/365 x no. of days
> 2,000% of AQ/365 x no. of days
10,001
20,000
0% - 150% of AQ/365 x no. of days
151% - 1,100 % of AQ/365 x no. of days
> 1,100% of AQ/365 x no. of days
20,001
73,200
0% - 300% of AQ/365 x no. of days
301% - 1,100 % of AQ/365 x no. of days
73,201
732,000
0% - 250% of AQ/365 x no. of days
251% - 1,000 % of AQ/365 x no. of days
> 1,000% of AQ/365 x no. of days
732,001
2,196,000
201% - 1,000% of AQ/365 x no. of days
2,196,001
29,300,000
151% % of AQ/365 x no. of days
> 700% of AQ/365 x no. of days
29,300,001
58,600,000
0% - 100% of AQ/365 x no. of days
101% - 400% of AQ/365 x no. of days
> 400% of AQ/365 x no. of days
58,600,001
and above
101% - 350% of AQ/365 x no. of days
> 350% of AQ/365 x no. of days

3. Implementation Approach
Implementation planned for implementation coincident with R3 (Nov UKL Release)
Implementation of 4658 leverages economies of scale of 3656 testing
Does not seek to duplicate test scenarios, as 3656 demonstrates that the functional processes utilise the amended value
Limited unique testing to demonstrate 4658 test scenarios work
Combined System Test / User Acceptance Test cycle for 4658
If 4658 encounters functional issues, 4658 will be backed out so as to preserve 3656 implementation
4658 will be available in Market Trials by virtue of the common code component for 3656